GB973418A - Diversity receiving system - Google Patents
Diversity receiving systemInfo
- Publication number
- GB973418A GB973418A GB7859/61A GB785961A GB973418A GB 973418 A GB973418 A GB 973418A GB 7859/61 A GB7859/61 A GB 7859/61A GB 785961 A GB785961 A GB 785961A GB 973418 A GB973418 A GB 973418A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- signals
- circuit
- supplied
- mixer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/084—Equal gain combining, only phase adjustments
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0865—Independent weighting, i.e. weights based on own antenna reception parameters
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
Abstract
973,418. Radio signalling. STANDARD TELEPHONES & CABLES Ltd. March 3, 1961 [March 7, 1960], No. 7859/61. Heading H4L. Relates to a diversity receiving system including an arrangement for bringing the received signals into phase for subsequent combination and is particularly applicable to an angle diversity system in which a number of directional aerials are energized by means of independent transmitters at different frequencies which co-operate with a corresponding number of receiving aerials appropriately orientated at the receiving station. As shown, a plurality of diversity signals of differing frequency are supplied via a wideband receiver 1 and I.F. amplifier 2 to the pre-detection combining circuit 3. At the input to the circuit 3 a mixer 5 receives the signals from the I.F. amplifier 2 together with a reference signal from an amplitude limiter 4 and the resultant frequency-spaced beat frequency signals are supplied to narrow band-pass filters 6 which are tuned to the respective signals. The outputs of the filters 6 together with the output signals from the I.F. amplifier 2 are supplied to a circuit 7 which is a heterodyning device and an amplitude product-taking device which supplies an output signal corresponding to the frequency of the reference signal. Each signal from the mixer 5 produces an output from its corresponding filter 6 in proportion to the degree of correlation between the associated input signal and the reference signal, and since each signal from the mixer 5 will have the same phase relationship with the reference signal as its associated input signal and the reference signal is supplied by the output of circuit 7, the combination of the signals from the filters 6 with their associated input signals in the circuit 7 will produce resultant beat frequency signals which are cophasal. Each individual output signal from the circuit 7 will have an amplitude proportional to the product of the corresponding carrier amplitude and its associated beat frequency signal from the filter 6 and is therefore proportional to the square of the amplitude of that particular carrier, thus giving a ratio-squared type of combination. If linear combining is required a limiter 9 is switched into circuit or alternatively the limiters 12 may be used. In a further arrangement a conventional mixer is substituted for the product multiplier 7. The output of the circuit 7 is supplied to an amplifier limiter 4 which has a pass-band such that only the desired beat frequency signal is passed and this combined signal provides the local oscillator signal for the mixer 5 and is also demodulated in the discriminator 15 and supplied to the utilization device 16. A further receiver 17 and combining circuit 3<SP>1</SP> operating under similar conditions with the mixer 5<SP>1</SP> utilizing the common reference signal, provides space diversity, the outputs from the circuits 7, 7<SP>1</SP>, being combined in the amplifier limiter 4. The combined output is also used to provide automatic gain control of the I.F. amplifiers 2, 2<SP>1</SP>. The signals supplied by the receiver 17 may be of the same or different frequency to those supplied by the. receiver 1.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US737172A US2975275A (en) | 1958-05-22 | 1958-05-22 | Combining system for diversity communication systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB973418A true GB973418A (en) | 1964-10-28 |
Family
ID=24962860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7859/61A Expired GB973418A (en) | 1958-05-22 | 1961-03-03 | Diversity receiving system |
Country Status (5)
Country | Link |
---|---|
US (1) | US2975275A (en) |
BE (1) | BE578916A (en) |
CH (1) | CH375760A (en) |
FR (3) | FR1237738A (en) |
GB (1) | GB973418A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2180724A (en) * | 1985-09-06 | 1987-04-01 | Ici Australia Ltd | Radio signalling system for remote control |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3036210A (en) * | 1959-11-02 | 1962-05-22 | Space General Corp | Electronically scanning antenna empolying plural phase-locked loops to produce optimum directivity |
US3187257A (en) * | 1960-05-16 | 1965-06-01 | Nippon Electric Co | Frequency-(or phase)-modulation intermediate-frequency combining reception system |
GB932808A (en) * | 1960-09-30 | 1963-07-31 | Gen Electric Co Ltd | Improvements in or relating to electric signal combining arrangements |
US3394374A (en) * | 1961-08-11 | 1968-07-23 | Packard Bell Electronics Corp | Retrodirective antenna array |
US3383599A (en) * | 1963-02-07 | 1968-05-14 | Nippon Electric Co | Multiple superheterodyne diversity receiver employing negative feedback |
US3987445A (en) * | 1963-02-11 | 1976-10-19 | Fales Iii David | Oblique scatter object detection and location system |
US3311832A (en) * | 1963-03-29 | 1967-03-28 | James H Schrader | Multiple input radio receiver |
FR1368258A (en) * | 1963-06-19 | 1964-07-31 | Csf | Phase correlation interferometers refinements |
FR1449700A (en) * | 1965-05-21 | 1966-05-06 | Thomson Houston Comp Francaise | Improvements to reception systems for very weak radio signals |
JPS5515124B1 (en) * | 1969-09-22 | 1980-04-21 | ||
US3568197A (en) * | 1969-12-05 | 1971-03-02 | Nasa | Antenna array phase quadrature tracking system |
US3798547A (en) * | 1972-12-29 | 1974-03-19 | Bell Telephone Labor Inc | Approximate cophasing for diversity receivers |
US3883870A (en) * | 1973-12-17 | 1975-05-13 | Hughes Aircraft Co | System for phase aligning parallel signal processing channels |
US4000466A (en) * | 1975-05-22 | 1976-12-28 | Iowa State University Research Foundation, Inc. | Apparatus for time-interval measurement |
US4555807A (en) * | 1983-08-08 | 1985-11-26 | Sanders Associates, Inc. | Apparatus and method for channel identification |
US4805229A (en) * | 1987-01-09 | 1989-02-14 | Scientific-Atlanta, Inc. | Diversity combiner |
JPH03213021A (en) * | 1990-01-18 | 1991-09-18 | Fujitsu Ltd | Sd receiver |
DE4108933A1 (en) * | 1991-03-19 | 1992-09-24 | Blaupunkt Werke Gmbh | FM CAR RADIO |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2042831A (en) * | 1934-05-28 | 1936-06-02 | Rca Corp | Receiving system |
US2089409A (en) * | 1936-04-14 | 1937-08-10 | Bell Telephone Labor Inc | Phase correcting means and method |
NL159175B (en) * | 1950-02-14 | Walterscheid Gmbh Jean | PIPE COUPLING. | |
US2713606A (en) * | 1952-04-18 | 1955-07-19 | Rca Corp | Color television systems |
-
1958
- 1958-05-22 US US737172A patent/US2975275A/en not_active Expired - Lifetime
-
1959
- 1959-05-21 FR FR795209A patent/FR1237738A/en not_active Expired
- 1959-05-22 CH CH7357959A patent/CH375760A/en unknown
- 1959-05-22 BE BE578916A patent/BE578916A/en unknown
-
1961
- 1961-03-03 GB GB7859/61A patent/GB973418A/en not_active Expired
- 1961-03-06 FR FR854710A patent/FR79625E/en not_active Expired
- 1961-03-14 FR FR855564A patent/FR79703E/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2180724A (en) * | 1985-09-06 | 1987-04-01 | Ici Australia Ltd | Radio signalling system for remote control |
GB2180724B (en) * | 1985-09-06 | 1989-08-16 | Ici Australia Ltd | Remotely initiated blasting assembly |
Also Published As
Publication number | Publication date |
---|---|
CH375760A (en) | 1964-03-15 |
FR1237738A (en) | 1960-08-05 |
FR79703E (en) | 1963-01-11 |
US2975275A (en) | 1961-03-14 |
BE578916A (en) | 1959-11-23 |
FR79625E (en) | 1962-12-28 |
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